A threefold morse potential

The potential was taken from the following paper:

@article{ST,
  title = {Phase-Space Approach to Solving the Time-Independent Schr\"odinger Equation},
  author = {Shimshovitz, Asaf and Tannor, David J.},
  journal = {Phys. Rev. Lett.},
  volume = {109},
  issue = {7},
  pages = {070402},
  numpages = {5},
  year = {2012},
  month = {Aug},
  doi = {10.1103/PhysRevLett.109.070402},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.109.070402},
  publisher = {American Physical Society}
}
Fix 2D potential plotter script